Note:We have
done some testing of this tutorial with older browser versions, such as Netscape
Navigator v.4.0 and Internet Explorer v.4.0 under both Windows and MacOS.
As long as JavaScript is enabled, the tutorial is usable with these versions,
although we have noted some problems with proper display of fonts and character
attributes such as italics and bold. Also, some text and some graphics appear
incorrectly positioned.

Navigation

Each page of the tutorial
provides two navigational tools:

At the top right corner
of the page is a navigation wheel with navigation arrows. The highlighted
number in the outer ring lets you know to which section the currently displayed
page belongs. Click on any section number to move to the first page of that
section. Click on "Contents" in the center of the wheel to move to the table
of contents listing, from which you can link to the beginning of any section
in the tutorial. The table of contents also includes links to this help
page and to a form that allows you to send questions or comments to the
tutorial's designers. The arrows beneath the wheel will take you to either
the immediately preceding page ("Back" arrow) or the immediately following
page ("Next" arrow).

Along the left side
of the page is a navigation bar. At top is the section number and title,
followed by a list of subsections. The subsection names are all hot links
and can be used to navigate within the section. At the very bottom of each
page is a set of arrows labeled "Back," "Next," and "Contents." These have
the same function as the identically labeled features of the navigation
wheel, described above.

Links are used throughout
the tutorial, both to show internal references, and to point to related information
on other web sites. In order to avoid losing track of your place in the tutorial
when you follow links, you need to understand a few things about the behavior
of the links:

In most cases, links
that point to material within the tutorial will appear in the current
browser window. Use your browser’s "Back" button (not the back
arrow in the tutorial’s navigation bar) if you wish to return to where
you were.

External links will
open in a separate browser window (a new session). To return to where
you were, either close the new browser window or bring the tutorial window
forward by clicking on it.

Printing

The tutorial is available
in the PDF format. If you do not have Adobe
Acrobat Reader®, which is needed to view PDF files, please click here .